Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 35
·12057-12067
·
IF 6.4
Zhenping Ma,Lei Zhang,Xianzhen Wang,Guang Xiao,Yongbao Feng,Wei Wang,Konghu Tian,Dewei Liang,Yagang Yao,Qiulong Li
With the rapid advancements of portable and wearable devices, high-efficiency electromagnetic interference (EMI) shielding materials are highly required to eliminate radiated electromagnetic pollution. Ti3C2Tx MXene has shown great application potential as an EMI SE material due to its good conductivity. However, a single-loss mechanism has many limitations. Herein, to enrich the electromagnetic-wave-loss ways, MXene@ZIF-67/multiwalled carbon nanotubes (MWCNTs) composite films were successfully prepared by vacuum-assisted filtration, combined with the introduction of magnetic ZIF-67 anchored on MXene by an electrostatic self-assembly method. The MXene@ZIF-67/MWCNTs composite film (MZ2M8) achieved the best EMI shielding performance of 63.6 dB at 32 μm thickness, and the contribution ratio of the scattering parameters for absorption to reflection, i.e., SEA to SET, was 66.94%, thus achieving high absorption loss. Due to the high aspect ratio of the MWCNTs and the densely stacked “brick–mortar” layered structure, the composite film also exhibited excellent flexibility and mechanical performance, in which MZ8M2 could deliver a high tensile strength of 115.2 MPa, ensuring practical applications in different environments. Moreover, the thermal conductivity of MZ2M8 reached 3.367 W m−1 K−1, realizing the synergistic effect of high shielding efficiency and heat-dissipation performance, and avoiding the phenomenon of heat accumulation caused by the conversion of electromagnetic waves into heat energy.
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ACS Applied Energy Materials
·
2023
·
IF 6.4
Xi Li,Youping Guo,Yiran Li,Renchun Fu
Transition metal cobalt oxide (Co3O4) with a typical spinel structure is considered a promising electrocatalyst for oxygen evolution reaction (OER). However, its OER catalytic performance is unsatisfactory owing to its limited activity. In this study, we demonstrate that using graphitic carbon nitride (g-C3N4) loaded Co3O4 nanoparticles and then anchoring them onto 2D Ti3C2Tx MXene with a layered structure can significantly enhance the OER catalytic performance. This performance may be due to the well-layered structure of g-C3N4, thereby enabling it to provide more attachment sites for Co3O4 nanoparticles, reducing their agglomeration properties and exposing more active sites to promote OER catalytic performance. When anchoring Co3O4@g-C3N4 on Ti3C2Tx MXene, solid-state interfacial interactions can adjust the structure of electrons and promote the rate of interfacial charge transfer, which enhances the conductivity of the catalyst and further promotes its OER catalytic performance. The overpotential required for TCN is 247 mV at a current density of 10 mA cm–2, which is significantly lower than that of pure Ti3C2Tx MXene (600 mV) and Co3O4@g-C3N4 (387 mV), in addition to exhibiting excellent electrochemical stability.
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Nano Research
·
2023
·
IF 9.9
Xu Shixin,Du Chen,Zhang Miaomiao,Wang Ruoying,Feng Wei,Wang Chengwei,Liu Qinsong,Zhao Wen
Endogenous electric fields (EFs) are capable of regulating the behaviors of skin cells in wound healing. However, majority of current dressings are primarily engaged in the passive repair of defective tissue, as they lack the ability to actively respond to physiological electrical signals. In this work, a series of nanofibrous membranes (NFMs) were fabricated by coaxial electrospinning, combining the good mechanical properties of poly(ε-caprolactone) (PCL), the bioactivity of gelatin and the electroactivity of Ti 3 C 2 T x MXene, as electroactive and antibacterial dressings for cutaneous wound healing. The obtained NFMs exhibited suitable mechanical properties and hydrophilicity, excellent electroactivity, antibacterial activity, and biocompatibility. Especially, Ti 3 C 2 T x MXene/PCL/gelatin-6 (MPG-6, 6 wt.% of Ti 3 C 2 T x MXene in sheath spinning liquids) showed the optimal conductivity and antibacterial activity. Excitingly, this scaffold significantly promoted the adhesion, proliferation, and migration of NIH 3T3 cells under the electrical stimulation (ES). The in vivo evaluation in a full-thickness wounds defect model demonstrated that the MPG-6 films significantly accelerated wound closure, increased granulation tissue formation, increased collagen deposition, and promoted wound vascularization. In summary, the versatile scaffold is expected to be an ideal candidate as wound dressings due to its ability to promote the transmission of physiological electrical signals and thus improved the therapeutic outcomes of wound regeneration.
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Crystals
·
2023
·Vol. 13
·期 7
·1005
·
IF 2.7
Zhiwei Liu,Guanlong Li,Yan Zhao,Xiangbao Chen
The rapid development of electronic technology has brought convenience and efficiency to the lives of modern people, while emphasizing the need for novel materials with designability and excellent dielectric properties at the same time. In this work, Ti3C2TxMXene nanosheets (MNSs) underwent NH3·H2O solvothermal treatment at temperatures of 40 °C, 60 °C, 80 °C, 100 °C, 120 °C, 140 °C, 160 °C, and 180 °C. The changes in the surface groups and dielectric properties after the solvothermal treatment were studied. The solvothermal treatment increased the proportion of surface -OH groups, which was beneficial to the permittivity of the MNSs. However, as the treating temperature increased, the amount of -OH on the surface of the MNSs showed a reducing trend, according to XPS spectra. As the treating temperature rose from 40 °C to 80 °C, the real part of the permittivity of MNS sample showed a significant decrease, eventually remaining approximately stable in the 80 °C to 180 °C samples. The results of electromagnetic characterization were in line with the group proportion, as determined via the XPS O1s spectra, supporting the previous conclusion that the -OH group played an important role in the permittivity.Keywords:NH3·H2O solvothermal;end groups;dielectric property;2D nanosheets
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ziquan Wang,Zheng Li,Bo Yong,Haiyan Huang,Lei Yao,Libo Deng
Membrane distillation (MD) is a promising technology with great potential to mitigate the crisis of water shortage. However, it still suffers from the low productivity due to that water vaporization on the membrane would reduce the transmembrane temperature and hence the permeate flux. Herein, an electrothermal membrane that can heat the feed solution on the membrane and hence enables the MD operation under a low electrical input was developed. This was achieved by coating a commercial PET-PTFE membrane with MXene nanosheets through a filtration method. The resultant MXene/PET-PTFE composite membrane could heat the surroundings (both air and brine) efficiently, showing a conversion efficiency of 73% at 1 W. Furthermore, it was shown that the composite membrane, while degrades rapidly in highly ionizable brine under a direct current (d.c.) input, could work stably over a long duration at high potential under high-frequency alternating current (a.c.) input. Systematic electrochemical impedance spectroscopic investigation suggested that the reciprocal vibration of ions under a high-frequency a.c. could inhibit the formation of electrical double layer, and thus depresses the electrochemical oxidation of MXene and water splitting. Furthermore, the composite membrane enabled efficient in-situ heating in a Joule heating MD (JHMD) system, delivering a permeate flux of 1.8 kg m −2 h −1 at an input power of 3 W, which is 333% higher than that based on the conventional MD process. Theoretical simulation of the temperature distribution by a finite element method (FEM) confirmed a higher transmembrane temperature in the JHMD system than in the conventional MD, which is responsible for the performance enhancement.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xuteng Xing,Yating Sui,Qiushi Li,Miao Yuan,Hantuo Zhao,Dan Zhou,Xiaomeng Chu,Shaojie Liu,Erjun Tang
Two-dimensional Ti 3 C 2 T x MXene is a promising anticorrosive filler for epoxy coating, but only passive protection makes Ti 3 C 2 T x -based composite coating unable to meet long-term anticorrosive requirements. For this reason, the ZnAl-NO 3 LDH layers and active corrosion inhibitor MoO 4 2- are introduced into Ti 3 C 2 T x MXene surface, where LDH layers cannot only be used as the acid response nanocontainer for MoO 4 2- , but also an additional active corrosion inhibitor, and a reservoir to trap Cl - . The obtained ZnAl-MoO 4 LDH@Ti 3 C 2 T x MXene composite corrosion inhibitor is an acid-response and active/passive protective dual-functional composite corrosion inhibitor. The ZnAl-MoO 4 LDH@Ti 3 C 2 T x MXene contained composite coating can exhibit the excellent anticorrosion performance and certain self-healing property, owing to the synergistic effect including the physical shielding effect of two-dimensional Ti 3 C 2 T x MXene, Cl - adsorption/capture effect of hydrotalcite, and inhibition membrane formation of Zn 2+ and MoO 4 2- in the composite corrosion inhibitor. This work is of great significance to the synthesis of multifunctional composite corrosion inhibitors and the application of Ti 3 C 2 T x MXene-based composite coatings in the field of corrosion protection.
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Materials Horizons
·
2023
·Vol. 10
·期 6
·2262-2270
·
IF 13.3
Renjie Ding,Jinhua Xiong,Qian Yan,Zhong Chen,Zonglin Liu,Xu Zhao,Qingyu Peng,Xiaodong He
Acid rain is a worldwide problem because of the emission of acidic gases into the atmosphere, leading to the acidification of first-order streams and aggravation of fresh water shortage. Therefore, it is of great importance to develop an environmentally friendly method for removing acid from water. Herein, an advanced technology that can achieve aqueous acid purification using solar energy is realized with Ti3C2Tx MXene/polyaniline (PANI) hybrid non-woven fabrics (MPs) through interfacial solar vapor generation, with PANI acting as an acid absorber through the doping process. Benefiting from the porous structure and crumpled micro-surface of MPs, a high evaporation rate of 2.65 kg m−2 h−1 with an efficiency of 93.7% can be achieved under one-sun illumination. Moreover, MPs present an even higher evaporation rate of 2.83 kg m−2 h−1 in high concentration aqueous acid and can generate clean water with a pH higher than 6.5. More importantly, thanks to the unique reversible doping process of PANI, when used as an aqueous acid purifier, MPs show good stability and reusability after dedoping. Our work sheds light on an efficient strategy for dealing with aqueous acid and acid rain.
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ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Fan Chen,Jinhao Wang,Lijuan Chen,Haoliang Lin,Dongxue Han,Yu Bao,Wei Wang,Li Niu
Wearable, noninvasive sensors enable the continuous monitoring of metabolites in sweat and provide clinical information related to an individual’s health and disease states. Uric acid (UA) is a key indicator highly associated with gout, hyperuricaemia, hypertension, kidney disease, and Lesch–Nyhan syndrome. However, the detection of UA levels typically relies on invasive blood tests. Therefore, developing a wearable device for noninvasive monitoring of UA concentrations in sweat could facilitate real-time personalized disease prevention. Here, we introduce 1,3,6,8-pyrene tetrasulfonic acid sodium salt (PyTS) as a bifunctional molecule functionalized with Ti3C2Tx via π–π conjugation to design nonenzymatic wearable sensors for sensitive and selective detection of UA concentration in human sweat. PyTS@Ti3C2Tx provides many oxidation–reduction active groups to enhance the electrocatalytic ability of the UA oxidation reaction. The PyTS@Ti3C2Tx-based electrochemical sensor demonstrates highly sensitive detection of UA in the concentration range of 5 μM–100 μM, exhibiting a lower detection limit of 0.48 μM compared to the uricase-based sensor (0.84 μM). In volunteers, the PyTS@Ti3C2Tx-based wearable sensor is integrated with flexible microfluidic sweat sampling and wireless electronics to enable real-time monitoring of UA levels during aerobic exercise. Simultaneously, it allows for comparison of blood UA levels via a commercial UA analyzer. Herein, this study provides a promising electrocatalyst strategy for nonenzymatic electrochemical UA sensor, enabling noninvasive real-time monitoring of UA levels in human sweat and personalized disease prevention.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-13
·
IF 5.3
Xu Yuying,Chen Lijuan,Guo Xiaohui,Zhang Jian,Guo Xiaobing,He Ziqian,Zhang Jiani,Han Dongxue
A label-free photoelectrochemical (PEC) biosensing strategy was constructed based on a Cu 2 MoS 4 @Ti 3 C 2 T x MXene heterojunction for the sensitive detection of tetracycline (TC) in milk. The Cu 2 MoS 4 @Ti 3 C 2 T x MXene heterojunction substantially facilitates the separation of photogenerated electron–hole pairs, a key element in enhancing the photocurrent response. Cu 2 MoS 4 , renowned for its visible-light absorption and photocatalytic properties, is combined synergistically with Ti 3 C 2 T x MXene, contributing a large surface area and outstanding electrical conductivity. The heterojunction not only elevates photocatalytic efficiency but also provides abundant π–π stacking sites on the surface of Ti 3 C 2 T x MXene. These sites enable the direct immobilization of the TC aptamer without chemical modification, thereby minimizing marker interference and improving the detection accuracy. Furthermore, the heterojunction structure broadens the light-absorption spectrum and enhances charge-transfer efficiency, resulting in a higher photocurrent response. The proposed PEC aptasensor demonstrates a favorable linear response to TC within the concentration range 5 to 300 nM, with a detection limit of 1.24 nM. These results are comparable to those achieved by high-performance liquid chromatography. This study is expected to pioneer a novel approach for the design of a label-free PEC aptasensor applicable to the bioanalysis of food samples. Graphical abstract
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Scientific Reports
·
2024
·Vol. 14
·期 1
·1-12
·
IF 3.8
Dong Chaoyang
To improve anti-icing traits of outdoor coatings, a synergy between photothermal and hydrophobic anti-icings was utilized to fabricate copolymer/Ti 3 C 2 T x MXene composite coatings with good transparency and adhesion. MXene contributes to photothermal trait from local surface plasmon resonance effect. Copolymer enables hydrophobicity from perfluoroalkyls-induced low surface energy and high surface roughness. An increase in MXene dose results in an increased surface roughness. With 140.0 ± 2.2° of water contact angle and 70% of light transmittance, the optimal film bears 2 wt% of MXene. High MXene dose results in large temperature-increase of film under sunlight. After 15 min of sunlight exposure, the temperature of optimal film surface in icing simulation increases from − 18 ℃ to 7.2 ℃. After 48 h of acid immersion, the temperature-increase of optimal film surface based on 300 s of sunlight irradiation reaches 28.7 ± 1.2 ℃. After 48 h of ultraviolet irradiation, the temperature-increase of optimal film surface is 30.7 ± 0.8 ℃. This surface has a water contact angle of 132.7 ± 1.1° after 48 h of acid immersion. This study gives impetus to a preparation of various composite coatings for outdoor anti-icing/deicing.
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Materials Today Sustainability
·
2024
·
IF 7.1
Wentao Huang,Jie Xia,Zhigang Li,Xiaoshuan Zhang
The pursuit of simple, cost-effective, and efficient flexible ammonia sensors is an area of keen interest. This study aimed to create a highly sensitive, affordable flexible sensing patch (FDP) for immediate ammonia and impedance monitoring. Using a laser direct writing technique, symmetrical graphene patterns were crafted onto commercial kapton tape. These patterns were folded in half, allowing the lower layer to serve as an impedance sensor and the upper layer as an electrode for ammonia detection. The modified Ti 3 C 2 T x MXene solution was introduced as the sensitive layer in response to ammonia gas, and we also explored how varying thicknesses of this sensitive layer affected the response results. Notably, the results highlighted that FDPs with two thicknesses (50 μL solution) offered optimal ammonia detection. With a detection limit of 150 ppb, impressive sensitivity (18.08%/ppm), exceptional linearity (0.996), and stability within the 0.5 ppm–20 ppm range, the overall performance of the FDP surpassed that of most reported ammonia sensor devices based on graphene materials. FDP was able to better characterize the shelf life of lamb at a cost of no more than $1.5. This study provides solutions for rapid ammonia detection and food quality assessment .
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Small
·
2025
·
IF 12.1
Ruixue Li,Peng Song,Zhenyuan Ji,Hu Zhou,Xiaoping Shen,Lirong Kong,Aihua Yuan
MXene film-derived flexible supercapacitors have shown great application foreground for wearable electronics, but the capacitive characteristics, especially when faced with mechanical deformations, are not satisfactory. Herein, a new kind of flexible electrode, MX/D-MoO 3 , is developed by using Ti 3 C 2 T x MXene film (MX) and defect-rich MoO 3 (D-MoO 3 ) as the “main body” and “spacer-contributor”, respectively. Results indicate that, with D-MoO 3 intercalation, notably enlarged layer spacing of Ti 3 C 2 T x nanosheets and boosted electrochemical active sites are fulfilled, which have facilitated wondrous property increases of 342% and 239% when compared to raw MX and MX/MoO 3 , respectively. Particularly, MX/D-MoO 3 -60 has a high specific capacitance of 2734.3 mF cm −2 at 1 mA cm −2 , which surpasses most of the counterparts reported thus far. The MX/D-MoO 3 -60-based all-solid-state supercapacitor presents the largest energy density of 96.3 µWh cm −2 at 205.9 µW cm −2 and an outstanding power density of 1871.4 µW cm −2 at 18.6 µWh cm −2 . Meanwhile, impressive stability with capacitance retention of 91.8% after 5 000 cycles and great mechanical flexibility with capacitance retention of 90.3% under bending angles from 0 to 180° are also exhibited. The superior properties and facile preparation endow MX/D-MoO 3 -60 with promising applications in wearable energy storage.
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